A new species of Thwomp called Rhomps made their debut in Super Mario Galaxy 2. (mariowiki.com)
They appear prominently in the track of Bowser's Castle, and a variant of them called Super Thwomps also appear in the track Rainbow Road. (mariowiki.com)
In the parallel dimension in which Koopa has turned Daisy's father into fungus and taken over rule there is both a shop called Thwomp's (after the classic Super Mario Bros enemy featured in Super Mario World, Super Mario Kart etc) and also a bar called Bullet Bills another enemy which has also been seen more than a few times from the game series. (superluigibros.com)